Return of the Dark Queen

In the climax to the mermaids' search for their pieces of the magical conch shell, Molly finds herself in the frozen seas of the Arctic. There she discovers that the Dark Queen has stolen the last conch piece and imprisoned ice mermaid Shivana. With the help of a friendly walrus, Molly rescues Shivana, and, dodging an attack by an enchanted polar bear, they set off to confront the Dark Queen in her distant lair.